Abstract Energy demand by a controller extensively depends on how its control strategy incorporates the desired environment. For greenhouses, existing optimal environment considerations by the control strategies are fixed level reference trajectory and allowable range for control outputs. The fixed level reference approach only favours a reference trajectory taken from a specified permissible range, instead of determining the reference path within the same range requiring lowest energy demand. The classical receding horizon control (RHC) implementation is limited to a single operation range due to the fixed format for problem formulation. This paper proposes the multi-operational ranges (MOR) based control strategy for RHC, which simultaneously handles the multiple constraints explicitly defined for control output. This new approach favours the straightforward design for the multiple constraints into various operational ranges, prioritised them based on the operational preferences, and accommodate all complications specified for temperature regulation of tomatoes. The greenhouse temperature regulation by proposed MOR RHC approach was compared with the established fixed two-level reference RHC with an adaptive transition, where each level represents the desired temperature for day or night operation. Results show that MOR approach achieves significant energy savings over the fixed level reference approach under identical environmental conditions.

中文翻译：

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基于优先级多操作范围的温室环境调节后退水平控制

摘要 控制器的能量需求很大程度上取决于其控制策略如何结合所需的环境。对于温室，控制策略现有的最佳环境考虑因素是固定水平参考轨迹和控制输出的允许范围。固定水平参考方法只倾向于从指定的允许范围内获取参考轨迹，而不是在需要最低能量需求的相同范围内确定参考路径。由于问题表述的固定格式，经典的后退水平控制 (RHC) 实施仅限于单个操作范围。本文提出了基于多操作范围 (MOR) 的 RHC 控制策略，该策略同时处理为控制输出明确定义的多个约束。这种新方法有利于将多个约束直接设计到各种操作范围内，根据操作偏好对它们进行优先排序，并适应为西红柿温度调节指定的所有复杂性。通过提出的 MOR RHC 方法将温室温度调节与已建立的具有自适应转换的固定两级参考 RHC 进行比较，其中每个水平代表白天或夜间操作所需的温度。结果表明，在相同的环境条件下，MOR 方法比固定水平参考方法实现了显着的节能。并适应为西红柿温度调节指定的所有并发症。通过提出的 MOR RHC 方法将温室温度调节与已建立的具有自适应转换的固定两级参考 RHC 进行比较，其中每个水平代表白天或夜间操作所需的温度。结果表明，在相同的环境条件下，MOR 方法比固定水平参考方法实现了显着的节能。并适应为西红柿温度调节指定的所有并发症。通过提出的 MOR RHC 方法将温室温度调节与已建立的具有自适应转换的固定两级参考 RHC 进行比较，其中每个水平代表白天或夜间操作所需的温度。结果表明，在相同的环境条件下，MOR 方法比固定水平参考方法实现了显着的节能。